<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table class="tree-table" :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen"></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3, 5, 10, 15]" :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper" :total="total" background>
      </el-pagination>
    </el-card>
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="parentCateChange" clearable></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="50%" @close="editCateDialogClosed">
      <el-form :model="editCateForm" ref="editCateFormRef" label-width="100px">
        <el-form-item label="分类名称:">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Cate',
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      cateList: [],
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      }, {
        label: '是否有效',
        type: 'template',
        template: 'isok'
      }, {
        label: '排序',
        type: 'template',
        template: 'order'
      }, {
        label: '操作',
        type: 'template',
        template: 'opt'
      }],
      addCateDialogVisible: false,
      editCateDialogVisible: false,
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: true,
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: [],
      editCateForm: {}
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data.result
      this.total = res.data.total
    },
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        this.addCateDialogVisible = false
        return this.$message.error('获取商品分类失败')
      }
      this.parentCateList = res.data
    },
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
      } else {
        this.addCateForm.cat_pid = 0
      }
      this.addCateForm.cat_level = this.selectedKeys.length
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          this.addCateDialogVisible = false
          return this.$message.error('添加商品分类失败')
        }
        this.addCateDialogVisible = false
        this.$message.success('添加商品分类成功')
        await this.getCateList()
      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    showEditCateDialog(id) {
      this.getCateById(id)
      this.editCateDialogVisible = true
    },
    async getCateById(id) {
      const { data: res } = await this.$http.get(`categories/${id}`)
      if (res.meta.status !== 200) {
        this.editCateDialogVisible = false
        return this.$message.error('获取商品分类失败')
      }
      this.editCateForm = res.data
    },
    async editCate() {
      const { data: res } = await this.$http.put(`categories/${this.editCateForm.cat_id}`, { cat_name: this.editCateForm.cat_name })
      if (res.meta.status !== 200) {
        this.editCateDialogVisible = false
        return this.$message.error('修改商品分类失败')
      }
      this.editCateDialogVisible = false
      this.$message.success('修改商品分类成功')
      await this.getCateList()
    },
    editCateDialogClosed() {
      this.$refs.editCateFormRef.resetFields()
      this.editCateForm = {}
    },
    async removeCateById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' })
        .catch(err => err)
      // 点'确定'返回confirm, 点'取消'返回cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败!')
      }
      this.$message.info('删除分类成功!')
      await this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
  .tree-table {
    margin-top: 15px;
  }
  .el-cascader {
    width: 100%;
  }
</style>
